For Pairs Trading, it takes advantage of the assumption that the securities have been moving back into the middle of Mean Reversion is a price or yield of securities that have a random linear motion at any time, it must adapt to the expected value or the mean long term if at some point of time, price or yield has moved out to a different level and middle level in the long term value. By Mean Reversion behavior come from Overreaction Hypothesis of securities from the investors information received and Tversky and Kahneman (1973) De Bondt and Thaler (1985) has made a study of the behavior of the stock price of United States during the year. R. 1916-1982 by splitting shares into two groups: Group Winners or stock prices are rising dramatically throughout the 3 years ago and Losers or stock price adjustment group ta dramatically throughout the 3 years ago and compare the yields realized during a later time after those shares.The group then found that the stocks in the group "winners" have significantly dropped prices. While shares in the group, "lost" is back for a price increase, which results in this study, Mean Reversion behavior support at the same time to reject the assumption of Random Walk also. There is also an assumption about the nature of the market price of the securities must be described by data in the past. Is the Random Walk hypothesis of behavior decline though Chaudhuri and Wu (2003) found that a Random Walk behaviour cannot be rejected, but on the contrary? Research of Huang Hoque et al (1995) and (2007). back to Random Walk behavior declined on the stock exchange of Thailand by Thai research of Hoque et al. (2007) proposed that a Random Walk behaviour will not be denied only during 1990-1997 only. The test model we use during the year, 2012 – 2014, which is a Random Walk behaviour during the protest, we forecast that we can make Excess Return from Trading Pairs strategy.
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